What are the characteristics that make elements different from compounds?

Each element is made of one type of atom, while compounds are made of two or more different elements.

How much heat (in joules) is needed to raise the temperature of 355 g of ethanol (c = 2.4 J/goC) by 63oC?

How many potassium atoms are in 250.0 grams of potassium? 1.66 x 10-24 atoms K 3.85 x 1024 atoms K 1.51 x 1026 atoms K 5.88 x 1027 atoms K

Al and Bob are arguing about their algorithms. Al claims his O (nlogn) - time method is always faster than Bob's O (n^2) - time method. To settle the issue, they perform a set of experiments.

Explain how to determine the average atomic mass from knowing the percent abundance of isotopes

What was the result of the atomic theory?

Explain mitosis and meiosis in your own words.

What device changes mechanical energy into electrical energy? Question 4 options: transformer generator copper wire light switch

Reaction rates are affected by how often the particles collide true false

A 25 N and 5 N force pull to the right. Friction is 10 N. If the object is 5 kg, find the net force and acceleration.